so i have a problem using the sscanf();. I have a GPS and it sends various data over serial communications to my touchscreen. Right now i just want to get the hours and minutes but when i used the sscanf it only grabbed the hours but not the minutes and im new to this function so i dont know what the problem is. heres my code:
#include <Adafruit_GPS.h>
#include <SoftwareSerial.h>
#define RXpin 3 //touchshield slide pins
#define TXpin 2
// If you're using a GPS module:
// Connect the GPS Power pin to 5V
// Connect the GPS Ground pin to ground
// If using software serial (sketch example default):
// Connect the GPS TX (transmit) pin to Digital 3
// Connect the GPS RX (receive) pin to Digital 2
// If using hardware serial (e.g. Arduino Mega):
// Connect the GPS TX (transmit) pin to Arduino RX1, RX2 or RX3
// Connect the GPS RX (receive) pin to matching TX1, TX2 or TX3
// If you're using the Adafruit GPS shield, change
// SoftwareSerial mySerial(3, 2); -> SoftwareSerial mySerial(8, 7);
// and make sure the switch is set to SoftSerial
// If using software serial, keep these lines enabled
// (you can change the pin numbers to match your wiring):
SoftwareSerial mySerial(6, 7);
SoftwareSerial touchSerial = SoftwareSerial(RXpin, TXpin);
Adafruit_GPS GPS(&mySerial);
// If using hardware serial (e.g. Arduino Mega), comment
// out the above six lines and enable this line instead:
//Adafruit_GPS GPS(&Serial1);
// Set GPSECHO to 'false' to turn off echoing the GPS data to the Serial console
// Set to 'true' if you want to debug and listen to the raw GPS sentences.
#define GPSECHO true
// this keeps track of whether we're using the interrupt
// off by default!
boolean usingInterrupt = false;
void useInterrupt(boolean); // Func prototype keeps Arduino 0023 happy
int tzhour;
int tzminute;
int tzseconds;
int tzmonth;
int tzyear;
int tzday;
void setup()
{
// connect at 115200 so we can read the GPS fast enough and echo without dropping chars
// also spit it out
touchSerial.begin(115200);
//Serial.println("Adafruit GPS library basic test!");
// 9600 NMEA is the default baud rate for Adafruit MTK GPS's- some use 4800
GPS.begin(9600);
//touchSerial.begin(9600);
// uncomment this line to turn on RMC (recommended minimum) and GGA (fix data) including altitude
GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCGGA);
// uncomment this line to turn on only the "minimum recommended" data
//GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCONLY);
// For parsing data, we don't suggest using anything but either RMC only or RMC+GGA since
// the parser doesn't care about other sentences at this time
// Set the update rate
GPS.sendCommand(PMTK_SET_NMEA_UPDATE_1HZ); // 1 Hz update rate
// For the parsing code to work nicely and have time to sort thru the data, and
// print it out we don't suggest using anything higher than 1 Hz
// Request updates on antenna status, comment out to keep quiet
GPS.sendCommand(PGCMD_ANTENNA);
// the nice thing about this code is you can have a timer0 interrupt go off
// every 1 millisecond, and read data from the GPS for you. that makes the
// loop code a heck of a lot easier!
useInterrupt(true);
delay(1000);
// Ask for firmware version
mySerial.println(PMTK_Q_RELEASE);
}
// Interrupt is called once a millisecond, looks for any new GPS data, and stores it
SIGNAL(TIMER0_COMPA_vect) {
char c = GPS.read();
// if you want to debug, this is a good time to do it!
#ifdef UDR0
if (GPSECHO)
if (c) UDR0 = c;
// writing direct to UDR0 is much much faster than Serial.print
// but only one character can be written at a time.
#endif
}
void useInterrupt(boolean v) {
if (v) {
// Timer0 is already used for millis() - we'll just interrupt somewhere
// in the middle and call the "Compare A" function above
OCR0A = 0xAF;
TIMSK0 |= _BV(OCIE0A);
usingInterrupt = true;
} else {
// do not call the interrupt function COMPA anymore
TIMSK0 &= ~_BV(OCIE0A);
usingInterrupt = false;
}
}
uint32_t timer = millis();
const int offset = 4; // Central Daylight Time (USA)
void loop(){ // run over and over again
// in case you are not using the interrupt above, you'll
// need to 'hand query' the GPS, not suggested :(
if (! usingInterrupt) {
// read data from the GPS in the 'main loop'
char c = GPS.read();
// if you want to debug, this is a good time to do it!
if (GPSECHO)
if (c) Serial.print(c);
}
// if a sentence is received, we can check the checksum, parse it...
if (GPS.newNMEAreceived()) {
// a tricky thing here is if we print the NMEA sentence, or data
// we end up not listening and catching other sentences!
// so be very wary if using OUTPUT_ALLDATA and trytng to print out data
//Serial.println(GPS.lastNMEA()); // this also sets the newNMEAreceived() flag to false
if (!GPS.parse(GPS.lastNMEA())) // this also sets the newNMEAreceived() flag to false
return; // we can fail to parse a sentence in which case we should just wait for another
}
// if millis() or timer wraps around, we'll just reset it
if (timer > millis()) timer = millis();
// approximately every 2 seconds or so, print out the current stats
if (millis() - timer > 1000) {
timer = millis(); // reset the timer
Serial.print("\nTime: ");
if (GPS.hour >= 0 && GPS.hour < offset) {
tzhour = GPS.hour + 20;
}
else {
tzhour = GPS.hour - offset;
}
if(tzhour>12){
tzhour = tzhour - 12;
}
tzminute = GPS.minute;
touchSerial.print(tzhour);touchSerial.print(":");
touchSerial.print(tzminute);
}
}
touch screen code:
int tzhour;
int tzminute;
char out[32];
void setup(){
Serial.begin(115200);
background(0);
}
void loop(){
char charIn = 0;
byte i = 0;
char stringIn[32] = "";
while(Serial.available()){
charIn = Serial.read();
stringIn[i] = charIn;
i++;
}
stringIn[i] = '\0';
int tzhour;
int tzminute;
// Clear screen and display the serial buffer as text
sscanf(stringIn, "%d,%*s,%d", &tzhour, &tzminute);
stroke(153);
dtostrf(tzhour,2,0,out);
text(out,25,20,15);
dtostrf(tzminute,2,0,out);
text(out,25,120,15);
}